n8 THE PHYSIOLOGY OF REPRODUCTION 



Some of the dcutobroque cells, instead of passing through the 

 transformations above described, rest for a time and subsequently 

 undergo i > t regressive changes, becoming converted, according to 

 Miss Lane-Claypon, either into follicular epithelial cells or into 

 interstitial cells. " Every cell of the germinal epithelium is probably 

 a potential ovum, relatively very few remaining in the protobroque 

 state, although some may still be seen at the periphery in ovaries of 

 the eighteenth day [of gestation in the rabbit]. Incomparably the 



c*l_ A^^"^ * ' I ' ' 



KID. ''''>. <>\ai v at liirth, showing pi iinmdial follicles. 

 (Kritin Williams' <>\>xt(tr'i< .<.-. Appli-toii ^\ Co.) 



greater juiil pass into the deutobroque state, preparatory, doubtless, 

 to the formation of ova. All cannot become nva, for the other forms 

 of cell ar- Deoeeeary I'm- the maintenance of the ovarian functions; 

 i'ly, therefore, only the most robust cells, and those which are 

 m-.<t conveniently situated for obtaining nourishment, undergo the 

 ovogenetic ch.uiLreK. This su^estioii wr.nM seem to lie l>orne out by 

 the fact that many more of the central cells, which are nearer the 



I'.xti*. K..J a _"-ii'-ial ar.-..iiiit >f tin- '_"_' .'iiid tlic [.lifiiMincna >f u.'i^enesis in 

 thr iliti'-i mi '_M-.iii|r-. , ,t" animals, ln.tli \"i-i t d n at-- and I nvci trl irate, with a 

 ..iiiijil-t- liililidu'i-ajiliv. see \VaM'\fr, " I >ii- < ;->rlil.-<-hts/.fl]cn." in Hertwig's 

 /A //,.//.././ rkl-ungslehn der IIV,-/,,///,./-,-. \,,\. i., .I.-na. liio:}; also Wilson, 



L-iid Kditiun. N,-w York, 1900. 



